Neither do I but they look a lot like Nepal Field Peas. I’ve also read they can handle those cold temperatures too.
I don’t know, I think they may be boiled like you would eat phaseolus beans or Yellow dried Peas. I do know that the pods are too Fibrous to eat. The greens/pea shoots would probably worth harvesting.
Another species Pisum fulvum sometimes has seeds that require cracking or scaring to break seedcoat and allow water in. I don’t think Austrian Field peas are close to this.
Speaking of which Pisum species are actually closely related to Lathyrus species. So much so, that Pisum was moved to Lathyrus by some taxonomists. They share lots of edibility, it may be worth investigating potential crosses as Lathyrus has lots of edible characteristics.